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A body cools from a temperature $3 T$ to $2 T$ in $10 minutes$ . The room temperature is $T$ . Assume that Newton's law of cooling is applicable. The temperature of the body at the end of the next $10 minutes$ will be

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Important Questions on Heat Transfer

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Alpha Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise-3>Q 10

Two rods $A$ and $B$ of different materials are welded together as shown in the figure. Their thermal conductivities are $K_{1}$ and $K_{2}$ . The thermal conductivity of the composite rod will be

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Alpha Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise-3>Q 11

A spherical black body with a radius of

12 cm

radiates

450 Watt

power at

500 K

. If the radius were halved and the temperature doubled, the power radiated in

Watt

would be ?

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Alpha Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise-3>Q 12

The power radiated by a black body is $P$ and it radiates maximum energy at wavelength, $\lambda_{0}$. If the temperature of the black body is now changed so that it radiates maximum energy at wavelength $\frac{3}{4} \lambda_{0},$ the power radiated by it becomes $n P$ . The value of $n$ is

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Alpha Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise-3>Q 13

1 kcal

of heat flowing through a rod of iron per second. When the rod is cut down to

4

pieces then what will be the heat flowing through each piece per second having the same differential temperature (temperature gradient)?

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Alpha Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise-3>Q 14

Black holes in orbit around a normal star are detected from the earth due to the frictional heating of infalling gas into the black hole, which can reach temperatures greater than

10^{6} K

. Assuming that the infalling gas can be modelled as a blackbody radiator then the wavelength of maximum power lies

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Alpha Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise-3>Q 15

Two conductors having the same width and length, thickness

d_{1}

and

d_{2}

thermal conductivity

K_{1}

and

K_{2}

are placed one above the other. Find the equivalent thermal conductivity.

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Alpha Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise-3>Q 16

A long metallic bar is carrying heat from one of its ends to the other end under steady-state. The variation of temperature

θ

along the length

x

of the bar from its hot end is best described by which of the following figures?

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Alpha Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise-3>Q 17

If a piece of metal is heated to temperature

θ

and then allowed to cool in a room which is at temperature

θ_{0}

, the graph between the temperature

T

of the metal and time

t

will be closest to

A body cools from a temperature 3T to 2T in 10 minutes. The room temperature is T. Assume that Newton's law of cooling is applicable. The temperature of the body at the end of the next 10 minutes will be

Important Questions on Heat Transfer

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A body cools from a temperature $3 T$ to $2 T$ in $10 minutes$ . The room temperature is $T$ . Assume that Newton's law of cooling is applicable. The temperature of the body at the end of the next $10 minutes$ will be